]> git.sesse.net Git - bcachefs-tools-debian/blobdiff - libbcachefs/btree_io.c
Update bcachefs sources to 7250b2ee5574 bcachefs: Fix deleted inodes btree in snapsho...
[bcachefs-tools-debian] / libbcachefs / btree_io.c
index c049876ee80be3cc4ca5e7813ddd42e1a9194490..4d2d6f93500d22008a1ce031b134494c52812212 100644 (file)
 #include "debug.h"
 #include "error.h"
 #include "extents.h"
-#include "io.h"
+#include "io_write.h"
 #include "journal_reclaim.h"
 #include "journal_seq_blacklist.h"
+#include "recovery.h"
 #include "super-io.h"
 #include "trace.h"
 
@@ -105,8 +106,8 @@ static void btree_bounce_free(struct bch_fs *c, size_t size,
                vpfree(p, size);
 }
 
-static void *btree_bounce_alloc_noprof(struct bch_fs *c, size_t size,
-                                      bool *used_mempool)
+static void *btree_bounce_alloc(struct bch_fs *c, size_t size,
+                               bool *used_mempool)
 {
        unsigned flags = memalloc_nofs_save();
        void *p;
@@ -114,7 +115,7 @@ static void *btree_bounce_alloc_noprof(struct bch_fs *c, size_t size,
        BUG_ON(size > btree_bytes(c));
 
        *used_mempool = false;
-       p = vpmalloc_noprof(size, __GFP_NOWARN|GFP_NOWAIT);
+       p = vpmalloc(size, __GFP_NOWARN|GFP_NOWAIT);
        if (!p) {
                *used_mempool = true;
                p = mempool_alloc(&c->btree_bounce_pool, GFP_NOFS);
@@ -122,8 +123,6 @@ static void *btree_bounce_alloc_noprof(struct bch_fs *c, size_t size,
        memalloc_nofs_restore(flags);
        return p;
 }
-#define btree_bounce_alloc(_c, _size, _used_mempool)           \
-       alloc_hooks(btree_bounce_alloc_noprof(_c, _size, _used_mempool))
 
 static void sort_bkey_ptrs(const struct btree *bt,
                           struct bkey_packed **ptrs, unsigned nr)
@@ -293,7 +292,7 @@ static void btree_node_sort(struct bch_fs *c, struct btree *b,
                            bool filter_whiteouts)
 {
        struct btree_node *out;
-       struct sort_iter sort_iter;
+       struct sort_iter_stack sort_iter;
        struct bset_tree *t;
        struct bset *start_bset = bset(b, &b->set[start_idx]);
        bool used_mempool = false;
@@ -302,13 +301,13 @@ static void btree_node_sort(struct bch_fs *c, struct btree *b,
        bool sorting_entire_node = start_idx == 0 &&
                end_idx == b->nsets;
 
-       sort_iter_init(&sort_iter, b);
+       sort_iter_stack_init(&sort_iter, b);
 
        for (t = b->set + start_idx;
             t < b->set + end_idx;
             t++) {
                u64s += le16_to_cpu(bset(b, t)->u64s);
-               sort_iter_add(&sort_iter,
+               sort_iter_add(&sort_iter.iter,
                              btree_bkey_first(b, t),
                              btree_bkey_last(b, t));
        }
@@ -321,7 +320,7 @@ static void btree_node_sort(struct bch_fs *c, struct btree *b,
 
        start_time = local_clock();
 
-       u64s = bch2_sort_keys(out->keys.start, &sort_iter, filter_whiteouts);
+       u64s = bch2_sort_keys(out->keys.start, &sort_iter.iter, filter_whiteouts);
 
        out->keys.u64s = cpu_to_le16(u64s);
 
@@ -337,7 +336,7 @@ static void btree_node_sort(struct bch_fs *c, struct btree *b,
        start_bset->journal_seq = cpu_to_le64(seq);
 
        if (sorting_entire_node) {
-               unsigned u64s = le16_to_cpu(out->keys.u64s);
+               u64s = le16_to_cpu(out->keys.u64s);
 
                BUG_ON(bytes != btree_bytes(c));
 
@@ -411,8 +410,6 @@ void bch2_btree_sort_into(struct bch_fs *c,
        bch2_verify_btree_nr_keys(dst);
 }
 
-#define SORT_CRIT      (4096 / sizeof(u64))
-
 /*
  * We're about to add another bset to the btree node, so if there's currently
  * too many bsets - sort some of them together:
@@ -513,16 +510,6 @@ void bch2_btree_init_next(struct btree_trans *trans, struct btree *b)
                bch2_trans_node_reinit_iter(trans, b);
 }
 
-static void btree_pos_to_text(struct printbuf *out, struct bch_fs *c,
-                         struct btree *b)
-{
-       prt_printf(out, "%s level %u/%u\n  ",
-              bch2_btree_ids[b->c.btree_id],
-              b->c.level,
-              bch2_btree_id_root(c, b->c.btree_id)->level);
-       bch2_bkey_val_to_text(out, c, bkey_i_to_s_c(&b->key));
-}
-
 static void btree_err_msg(struct printbuf *out, struct bch_fs *c,
                          struct bch_dev *ca,
                          struct btree *b, struct bset *i,
@@ -535,7 +522,7 @@ static void btree_err_msg(struct printbuf *out, struct bch_fs *c,
        if (ca)
                prt_printf(out, "on %s ", ca->name);
        prt_printf(out, "at btree ");
-       btree_pos_to_text(out, c, b);
+       bch2_btree_pos_to_text(out, c, b);
 
        prt_printf(out, "\n  node offset %u", b->written);
        if (i)
@@ -543,42 +530,19 @@ static void btree_err_msg(struct printbuf *out, struct bch_fs *c,
        prt_str(out, ": ");
 }
 
-enum btree_err_type {
-       /*
-        * We can repair this locally, and we're after the checksum check so
-        * there's no need to try another replica:
-        */
-       BTREE_ERR_FIXABLE,
-       /*
-        * We can repair this if we have to, but we should try reading another
-        * replica if we can:
-        */
-       BTREE_ERR_WANT_RETRY,
-       /*
-        * Read another replica if we have one, otherwise consider the whole
-        * node bad:
-        */
-       BTREE_ERR_MUST_RETRY,
-       BTREE_ERR_BAD_NODE,
-       BTREE_ERR_INCOMPATIBLE,
-};
-
-enum btree_validate_ret {
-       BTREE_RETRY_READ = 64,
-};
-
-static int __btree_err(enum btree_err_type type,
+__printf(9, 10)
+static int __btree_err(int ret,
                       struct bch_fs *c,
                       struct bch_dev *ca,
                       struct btree *b,
                       struct bset *i,
                       int write,
                       bool have_retry,
+                      enum bch_sb_error_id err_type,
                       const char *fmt, ...)
 {
        struct printbuf out = PRINTBUF;
        va_list args;
-       int ret = -BCH_ERR_fsck_fix;
 
        btree_err_msg(&out, c, ca, b, i, b->written, write);
 
@@ -594,27 +558,32 @@ static int __btree_err(enum btree_err_type type,
                goto out;
        }
 
-       if (!have_retry && type == BTREE_ERR_WANT_RETRY)
-               type = BTREE_ERR_FIXABLE;
-       if (!have_retry && type == BTREE_ERR_MUST_RETRY)
-               type = BTREE_ERR_BAD_NODE;
+       if (!have_retry && ret == -BCH_ERR_btree_node_read_err_want_retry)
+               ret = -BCH_ERR_btree_node_read_err_fixable;
+       if (!have_retry && ret == -BCH_ERR_btree_node_read_err_must_retry)
+               ret = -BCH_ERR_btree_node_read_err_bad_node;
+
+       if (ret != -BCH_ERR_btree_node_read_err_fixable)
+               bch2_sb_error_count(c, err_type);
 
-       switch (type) {
-       case BTREE_ERR_FIXABLE:
-               mustfix_fsck_err(c, "%s", out.buf);
+       switch (ret) {
+       case -BCH_ERR_btree_node_read_err_fixable:
+               ret = bch2_fsck_err(c, FSCK_CAN_FIX, err_type, "%s", out.buf);
+               if (ret != -BCH_ERR_fsck_fix &&
+                   ret != -BCH_ERR_fsck_ignore)
+                       goto fsck_err;
                ret = -BCH_ERR_fsck_fix;
                break;
-       case BTREE_ERR_WANT_RETRY:
-       case BTREE_ERR_MUST_RETRY:
+       case -BCH_ERR_btree_node_read_err_want_retry:
+       case -BCH_ERR_btree_node_read_err_must_retry:
                bch2_print_string_as_lines(KERN_ERR, out.buf);
-               ret = BTREE_RETRY_READ;
                break;
-       case BTREE_ERR_BAD_NODE:
+       case -BCH_ERR_btree_node_read_err_bad_node:
                bch2_print_string_as_lines(KERN_ERR, out.buf);
                bch2_topology_error(c);
                ret = bch2_run_explicit_recovery_pass(c, BCH_RECOVERY_PASS_check_topology) ?: -EIO;
                break;
-       case BTREE_ERR_INCOMPATIBLE:
+       case -BCH_ERR_btree_node_read_err_incompatible:
                bch2_print_string_as_lines(KERN_ERR, out.buf);
                ret = -BCH_ERR_fsck_errors_not_fixed;
                break;
@@ -627,12 +596,17 @@ fsck_err:
        return ret;
 }
 
-#define btree_err(type, c, ca, b, i, msg, ...)                         \
+#define btree_err(type, c, ca, b, i, _err_type, msg, ...)              \
 ({                                                                     \
-       int _ret = __btree_err(type, c, ca, b, i, write, have_retry, msg, ##__VA_ARGS__);\
+       int _ret = __btree_err(type, c, ca, b, i, write, have_retry,    \
+                              BCH_FSCK_ERR_##_err_type,                \
+                              msg, ##__VA_ARGS__);                     \
                                                                        \
-       if (_ret != -BCH_ERR_fsck_fix)                                  \
+       if (_ret != -BCH_ERR_fsck_fix) {                                \
+               ret = _ret;                                             \
                goto fsck_err;                                          \
+       }                                                               \
+                                                                       \
        *saw_error = true;                                              \
 })
 
@@ -646,9 +620,6 @@ __cold
 void bch2_btree_node_drop_keys_outside_node(struct btree *b)
 {
        struct bset_tree *t;
-       struct bkey_s_c k;
-       struct bkey unpacked;
-       struct btree_node_iter iter;
 
        for_each_bset(b, t) {
                struct bset *i = bset(b, t);
@@ -684,6 +655,9 @@ void bch2_btree_node_drop_keys_outside_node(struct btree *b)
        bch2_bset_set_no_aux_tree(b, b->set);
        bch2_btree_build_aux_trees(b);
 
+       struct bkey_s_c k;
+       struct bkey unpacked;
+       struct btree_node_iter iter;
        for_each_btree_node_key_unpack(b, k, &iter, &unpacked) {
                BUG_ON(bpos_lt(k.k->p, b->data->min_key));
                BUG_ON(bpos_gt(k.k->p, b->data->max_key));
@@ -696,19 +670,22 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
                         int write, bool have_retry, bool *saw_error)
 {
        unsigned version = le16_to_cpu(i->version);
-       const char *err;
        struct printbuf buf1 = PRINTBUF;
        struct printbuf buf2 = PRINTBUF;
        int ret = 0;
 
        btree_err_on(!bch2_version_compatible(version),
-                    BTREE_ERR_INCOMPATIBLE, c, ca, b, i,
+                    -BCH_ERR_btree_node_read_err_incompatible,
+                    c, ca, b, i,
+                    btree_node_unsupported_version,
                     "unsupported bset version %u.%u",
                     BCH_VERSION_MAJOR(version),
                     BCH_VERSION_MINOR(version));
 
        if (btree_err_on(version < c->sb.version_min,
-                        BTREE_ERR_FIXABLE, c, NULL, b, i,
+                        -BCH_ERR_btree_node_read_err_fixable,
+                        c, NULL, b, i,
+                        btree_node_bset_older_than_sb_min,
                         "bset version %u older than superblock version_min %u",
                         version, c->sb.version_min)) {
                mutex_lock(&c->sb_lock);
@@ -719,7 +696,9 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
 
        if (btree_err_on(BCH_VERSION_MAJOR(version) >
                         BCH_VERSION_MAJOR(c->sb.version),
-                        BTREE_ERR_FIXABLE, c, NULL, b, i,
+                        -BCH_ERR_btree_node_read_err_fixable,
+                        c, NULL, b, i,
+                        btree_node_bset_newer_than_sb,
                         "bset version %u newer than superblock version %u",
                         version, c->sb.version)) {
                mutex_lock(&c->sb_lock);
@@ -729,11 +708,15 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
        }
 
        btree_err_on(BSET_SEPARATE_WHITEOUTS(i),
-                    BTREE_ERR_INCOMPATIBLE, c, ca, b, i,
+                    -BCH_ERR_btree_node_read_err_incompatible,
+                    c, ca, b, i,
+                    btree_node_unsupported_version,
                     "BSET_SEPARATE_WHITEOUTS no longer supported");
 
        if (btree_err_on(offset + sectors > btree_sectors(c),
-                        BTREE_ERR_FIXABLE, c, ca, b, i,
+                        -BCH_ERR_btree_node_read_err_fixable,
+                        c, ca, b, i,
+                        bset_past_end_of_btree_node,
                         "bset past end of btree node")) {
                i->u64s = 0;
                ret = 0;
@@ -741,12 +724,15 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
        }
 
        btree_err_on(offset && !i->u64s,
-                    BTREE_ERR_FIXABLE, c, ca, b, i,
+                    -BCH_ERR_btree_node_read_err_fixable,
+                    c, ca, b, i,
+                    bset_empty,
                     "empty bset");
 
-       btree_err_on(BSET_OFFSET(i) &&
-                    BSET_OFFSET(i) != offset,
-                    BTREE_ERR_WANT_RETRY, c, ca, b, i,
+       btree_err_on(BSET_OFFSET(i) && BSET_OFFSET(i) != offset,
+                    -BCH_ERR_btree_node_read_err_want_retry,
+                    c, ca, b, i,
+                    bset_wrong_sector_offset,
                     "bset at wrong sector offset");
 
        if (!offset) {
@@ -760,16 +746,22 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
 
                        /* XXX endianness */
                        btree_err_on(bp->seq != bn->keys.seq,
-                                    BTREE_ERR_MUST_RETRY, c, ca, b, NULL,
+                                    -BCH_ERR_btree_node_read_err_must_retry,
+                                    c, ca, b, NULL,
+                                    bset_bad_seq,
                                     "incorrect sequence number (wrong btree node)");
                }
 
                btree_err_on(BTREE_NODE_ID(bn) != b->c.btree_id,
-                            BTREE_ERR_MUST_RETRY, c, ca, b, i,
+                            -BCH_ERR_btree_node_read_err_must_retry,
+                            c, ca, b, i,
+                            btree_node_bad_btree,
                             "incorrect btree id");
 
                btree_err_on(BTREE_NODE_LEVEL(bn) != b->c.level,
-                            BTREE_ERR_MUST_RETRY, c, ca, b, i,
+                            -BCH_ERR_btree_node_read_err_must_retry,
+                            c, ca, b, i,
+                            btree_node_bad_level,
                             "incorrect level");
 
                if (!write)
@@ -786,7 +778,9 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
                        }
 
                        btree_err_on(!bpos_eq(b->data->min_key, bp->min_key),
-                                    BTREE_ERR_MUST_RETRY, c, ca, b, NULL,
+                                    -BCH_ERR_btree_node_read_err_must_retry,
+                                    c, ca, b, NULL,
+                                    btree_node_bad_min_key,
                                     "incorrect min_key: got %s should be %s",
                                     (printbuf_reset(&buf1),
                                      bch2_bpos_to_text(&buf1, bn->min_key), buf1.buf),
@@ -795,7 +789,9 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
                }
 
                btree_err_on(!bpos_eq(bn->max_key, b->key.k.p),
-                            BTREE_ERR_MUST_RETRY, c, ca, b, i,
+                            -BCH_ERR_btree_node_read_err_must_retry,
+                            c, ca, b, i,
+                            btree_node_bad_max_key,
                             "incorrect max key %s",
                             (printbuf_reset(&buf1),
                              bch2_bpos_to_text(&buf1, bn->max_key), buf1.buf));
@@ -804,10 +800,14 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
                        compat_btree_node(b->c.level, b->c.btree_id, version,
                                          BSET_BIG_ENDIAN(i), write, bn);
 
-               err = bch2_bkey_format_validate(&bn->format);
-               btree_err_on(err,
-                            BTREE_ERR_BAD_NODE, c, ca, b, i,
-                            "invalid bkey format: %s", err);
+               btree_err_on(bch2_bkey_format_invalid(c, &bn->format, write, &buf1),
+                            -BCH_ERR_btree_node_read_err_bad_node,
+                            c, ca, b, i,
+                            btree_node_bad_format,
+                            "invalid bkey format: %s\n  %s", buf1.buf,
+                            (printbuf_reset(&buf2),
+                             bch2_bkey_format_to_text(&buf2, &bn->format), buf2.buf));
+               printbuf_reset(&buf1);
 
                compat_bformat(b->c.level, b->c.btree_id, version,
                               BSET_BIG_ENDIAN(i), write,
@@ -826,7 +826,7 @@ static int bset_key_invalid(struct bch_fs *c, struct btree *b,
                            struct printbuf *err)
 {
        return __bch2_bkey_invalid(c, k, btree_node_type(b), READ, err) ?:
-               (!updated_range ? bch2_bkey_in_btree_node(b, k, err) : 0) ?:
+               (!updated_range ? bch2_bkey_in_btree_node(c, b, k, err) : 0) ?:
                (rw == WRITE ? bch2_bkey_val_invalid(c, k, READ, err) : 0);
 }
 
@@ -847,14 +847,18 @@ static int validate_bset_keys(struct bch_fs *c, struct btree *b,
                struct bkey tmp;
 
                if (btree_err_on(bkey_p_next(k) > vstruct_last(i),
-                                BTREE_ERR_FIXABLE, c, NULL, b, i,
+                                -BCH_ERR_btree_node_read_err_fixable,
+                                c, NULL, b, i,
+                                btree_node_bkey_past_bset_end,
                                 "key extends past end of bset")) {
                        i->u64s = cpu_to_le16((u64 *) k - i->_data);
                        break;
                }
 
                if (btree_err_on(k->format > KEY_FORMAT_CURRENT,
-                                BTREE_ERR_FIXABLE, c, NULL, b, i,
+                                -BCH_ERR_btree_node_read_err_fixable,
+                                c, NULL, b, i,
+                                btree_node_bkey_bad_format,
                                 "invalid bkey format %u", k->format)) {
                        i->u64s = cpu_to_le16(le16_to_cpu(i->u64s) - k->u64s);
                        memmove_u64s_down(k, bkey_p_next(k),
@@ -873,12 +877,14 @@ static int validate_bset_keys(struct bch_fs *c, struct btree *b,
                printbuf_reset(&buf);
                if (bset_key_invalid(c, b, u.s_c, updated_range, write, &buf)) {
                        printbuf_reset(&buf);
-                       prt_printf(&buf, "invalid bkey:  ");
                        bset_key_invalid(c, b, u.s_c, updated_range, write, &buf);
                        prt_printf(&buf, "\n  ");
                        bch2_bkey_val_to_text(&buf, c, u.s_c);
 
-                       btree_err(BTREE_ERR_FIXABLE, c, NULL, b, i, "%s", buf.buf);
+                       btree_err(-BCH_ERR_btree_node_read_err_fixable,
+                                 c, NULL, b, i,
+                                 btree_node_bad_bkey,
+                                 "invalid bkey: %s", buf.buf);
 
                        i->u64s = cpu_to_le16(le16_to_cpu(i->u64s) - k->u64s);
                        memmove_u64s_down(k, bkey_p_next(k),
@@ -902,7 +908,10 @@ static int validate_bset_keys(struct bch_fs *c, struct btree *b,
 
                        bch2_dump_bset(c, b, i, 0);
 
-                       if (btree_err(BTREE_ERR_FIXABLE, c, NULL, b, i, "%s", buf.buf)) {
+                       if (btree_err(-BCH_ERR_btree_node_read_err_fixable,
+                                     c, NULL, b, i,
+                                     btree_node_bkey_out_of_order,
+                                     "%s", buf.buf)) {
                                i->u64s = cpu_to_le16(le16_to_cpu(i->u64s) - k->u64s);
                                memmove_u64s_down(k, bkey_p_next(k),
                                                  (u64 *) vstruct_end(i) - (u64 *) k);
@@ -931,7 +940,6 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
        bool updated_range = b->key.k.type == KEY_TYPE_btree_ptr_v2 &&
                BTREE_PTR_RANGE_UPDATED(&bkey_i_to_btree_ptr_v2(&b->key)->v);
        unsigned u64s;
-       unsigned blacklisted_written, nonblacklisted_written = 0;
        unsigned ptr_written = btree_ptr_sectors_written(&b->key);
        struct printbuf buf = PRINTBUF;
        int ret = 0, retry_read = 0, write = READ;
@@ -941,51 +949,65 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
        b->written = 0;
 
        iter = mempool_alloc(&c->fill_iter, GFP_NOFS);
-       sort_iter_init(iter, b);
-       iter->size = (btree_blocks(c) + 1) * 2;
+       sort_iter_init(iter, b, (btree_blocks(c) + 1) * 2);
 
        if (bch2_meta_read_fault("btree"))
-               btree_err(BTREE_ERR_MUST_RETRY, c, ca, b, NULL,
+               btree_err(-BCH_ERR_btree_node_read_err_must_retry,
+                         c, ca, b, NULL,
+                         btree_node_fault_injected,
                          "dynamic fault");
 
        btree_err_on(le64_to_cpu(b->data->magic) != bset_magic(c),
-                    BTREE_ERR_MUST_RETRY, c, ca, b, NULL,
+                    -BCH_ERR_btree_node_read_err_must_retry,
+                    c, ca, b, NULL,
+                    btree_node_bad_magic,
                     "bad magic: want %llx, got %llx",
                     bset_magic(c), le64_to_cpu(b->data->magic));
 
-       btree_err_on(!b->data->keys.seq,
-                    BTREE_ERR_MUST_RETRY, c, ca, b, NULL,
-                    "bad btree header: seq 0");
-
        if (b->key.k.type == KEY_TYPE_btree_ptr_v2) {
                struct bch_btree_ptr_v2 *bp =
                        &bkey_i_to_btree_ptr_v2(&b->key)->v;
 
                btree_err_on(b->data->keys.seq != bp->seq,
-                            BTREE_ERR_MUST_RETRY, c, ca, b, NULL,
+                            -BCH_ERR_btree_node_read_err_must_retry,
+                            c, ca, b, NULL,
+                            btree_node_bad_seq,
                             "got wrong btree node (seq %llx want %llx)",
                             b->data->keys.seq, bp->seq);
+       } else {
+               btree_err_on(!b->data->keys.seq,
+                            -BCH_ERR_btree_node_read_err_must_retry,
+                            c, ca, b, NULL,
+                            btree_node_bad_seq,
+                            "bad btree header: seq 0");
        }
 
        while (b->written < (ptr_written ?: btree_sectors(c))) {
                unsigned sectors;
                struct nonce nonce;
-               struct bch_csum csum;
                bool first = !b->written;
+               bool csum_bad;
 
                if (!b->written) {
                        i = &b->data->keys;
 
                        btree_err_on(!bch2_checksum_type_valid(c, BSET_CSUM_TYPE(i)),
-                                    BTREE_ERR_WANT_RETRY, c, ca, b, i,
-                                    "unknown checksum type %llu",
-                                    BSET_CSUM_TYPE(i));
+                                    -BCH_ERR_btree_node_read_err_want_retry,
+                                    c, ca, b, i,
+                                    bset_unknown_csum,
+                                    "unknown checksum type %llu", BSET_CSUM_TYPE(i));
 
                        nonce = btree_nonce(i, b->written << 9);
-                       csum = csum_vstruct(c, BSET_CSUM_TYPE(i), nonce, b->data);
 
-                       btree_err_on(bch2_crc_cmp(csum, b->data->csum),
-                                    BTREE_ERR_WANT_RETRY, c, ca, b, i,
+                       csum_bad = bch2_crc_cmp(b->data->csum,
+                               csum_vstruct(c, BSET_CSUM_TYPE(i), nonce, b->data));
+                       if (csum_bad)
+                               bch2_io_error(ca, BCH_MEMBER_ERROR_checksum);
+
+                       btree_err_on(csum_bad,
+                                    -BCH_ERR_btree_node_read_err_want_retry,
+                                    c, ca, b, i,
+                                    bset_bad_csum,
                                     "invalid checksum");
 
                        ret = bset_encrypt(c, i, b->written << 9);
@@ -995,7 +1017,9 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
 
                        btree_err_on(btree_node_type_is_extents(btree_node_type(b)) &&
                                     !BTREE_NODE_NEW_EXTENT_OVERWRITE(b->data),
-                                    BTREE_ERR_INCOMPATIBLE, c, NULL, b, NULL,
+                                    -BCH_ERR_btree_node_read_err_incompatible,
+                                    c, NULL, b, NULL,
+                                    btree_node_unsupported_version,
                                     "btree node does not have NEW_EXTENT_OVERWRITE set");
 
                        sectors = vstruct_sectors(b->data, c->block_bits);
@@ -1007,15 +1031,21 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
                                break;
 
                        btree_err_on(!bch2_checksum_type_valid(c, BSET_CSUM_TYPE(i)),
-                                    BTREE_ERR_WANT_RETRY, c, ca, b, i,
-                                    "unknown checksum type %llu",
-                                    BSET_CSUM_TYPE(i));
+                                    -BCH_ERR_btree_node_read_err_want_retry,
+                                    c, ca, b, i,
+                                    bset_unknown_csum,
+                                    "unknown checksum type %llu", BSET_CSUM_TYPE(i));
 
                        nonce = btree_nonce(i, b->written << 9);
-                       csum = csum_vstruct(c, BSET_CSUM_TYPE(i), nonce, bne);
-
-                       btree_err_on(bch2_crc_cmp(csum, bne->csum),
-                                    BTREE_ERR_WANT_RETRY, c, ca, b, i,
+                       csum_bad = bch2_crc_cmp(bne->csum,
+                               csum_vstruct(c, BSET_CSUM_TYPE(i), nonce, bne));
+                       if (csum_bad)
+                               bch2_io_error(ca, BCH_MEMBER_ERROR_checksum);
+
+                       btree_err_on(csum_bad,
+                                    -BCH_ERR_btree_node_read_err_want_retry,
+                                    c, ca, b, i,
+                                    bset_bad_csum,
                                     "invalid checksum");
 
                        ret = bset_encrypt(c, i, b->written << 9);
@@ -1048,12 +1078,16 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
                                        true);
 
                btree_err_on(blacklisted && first,
-                            BTREE_ERR_FIXABLE, c, ca, b, i,
+                            -BCH_ERR_btree_node_read_err_fixable,
+                            c, ca, b, i,
+                            bset_blacklisted_journal_seq,
                             "first btree node bset has blacklisted journal seq (%llu)",
                             le64_to_cpu(i->journal_seq));
 
                btree_err_on(blacklisted && ptr_written,
-                            BTREE_ERR_FIXABLE, c, ca, b, i,
+                            -BCH_ERR_btree_node_read_err_fixable,
+                            c, ca, b, i,
+                            first_bset_blacklisted_journal_seq,
                             "found blacklisted bset (journal seq %llu) in btree node at offset %u-%u/%u",
                             le64_to_cpu(i->journal_seq),
                             b->written, b->written + sectors, ptr_written);
@@ -1066,13 +1100,13 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
                sort_iter_add(iter,
                              vstruct_idx(i, 0),
                              vstruct_last(i));
-
-               nonblacklisted_written = b->written;
        }
 
        if (ptr_written) {
                btree_err_on(b->written < ptr_written,
-                            BTREE_ERR_WANT_RETRY, c, ca, b, NULL,
+                            -BCH_ERR_btree_node_read_err_want_retry,
+                            c, ca, b, NULL,
+                            btree_node_data_missing,
                             "btree node data missing: expected %u sectors, found %u",
                             ptr_written, b->written);
        } else {
@@ -1083,20 +1117,10 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
                                     !bch2_journal_seq_is_blacklisted(c,
                                                                      le64_to_cpu(bne->keys.journal_seq),
                                                                      true),
-                                    BTREE_ERR_WANT_RETRY, c, ca, b, NULL,
+                                    -BCH_ERR_btree_node_read_err_want_retry,
+                                    c, ca, b, NULL,
+                                    btree_node_bset_after_end,
                                     "found bset signature after last bset");
-
-               /*
-                * Blacklisted bsets are those that were written after the most recent
-                * (flush) journal write. Since there wasn't a flush, they may not have
-                * made it to all devices - which means we shouldn't write new bsets
-                * after them, as that could leave a gap and then reads from that device
-                * wouldn't find all the bsets in that btree node - which means it's
-                * important that we start writing new bsets after the most recent _non_
-                * blacklisted bset:
-                */
-               blacklisted_written = b->written;
-               b->written = nonblacklisted_written;
        }
 
        sorted = btree_bounce_alloc(c, btree_bytes(c), &used_mempool);
@@ -1137,7 +1161,10 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
                        prt_printf(&buf, "\n  ");
                        bch2_bkey_val_to_text(&buf, c, u.s_c);
 
-                       btree_err(BTREE_ERR_FIXABLE, c, NULL, b, i, "%s", buf.buf);
+                       btree_err(-BCH_ERR_btree_node_read_err_fixable,
+                                 c, NULL, b, i,
+                                 btree_node_bad_bkey,
+                                 "%s", buf.buf);
 
                        btree_keys_account_key_drop(&b->nr, 0, k);
 
@@ -1164,9 +1191,9 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
        btree_node_reset_sib_u64s(b);
 
        bkey_for_each_ptr(bch2_bkey_ptrs(bkey_i_to_s(&b->key)), ptr) {
-               struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
+               struct bch_dev *ca2 = bch_dev_bkey_exists(c, ptr->dev);
 
-               if (ca->mi.state != BCH_MEMBER_STATE_rw)
+               if (ca2->mi.state != BCH_MEMBER_STATE_rw)
                        set_btree_node_need_rewrite(b);
        }
 
@@ -1177,7 +1204,8 @@ out:
        printbuf_exit(&buf);
        return retry_read;
 fsck_err:
-       if (ret == BTREE_RETRY_READ)
+       if (ret == -BCH_ERR_btree_node_read_err_want_retry ||
+           ret == -BCH_ERR_btree_node_read_err_must_retry)
                retry_read = 1;
        else
                set_btree_node_read_error(b);
@@ -1216,8 +1244,9 @@ static void btree_node_read_work(struct work_struct *work)
                }
 start:
                printbuf_reset(&buf);
-               btree_pos_to_text(&buf, c, b);
-               bch2_dev_io_err_on(bio->bi_status, ca, "btree read error %s for %s",
+               bch2_btree_pos_to_text(&buf, c, b);
+               bch2_dev_io_err_on(bio->bi_status, ca, BCH_MEMBER_ERROR_read,
+                                  "btree read error %s for %s",
                                   bch2_blk_status_to_str(bio->bi_status), buf.buf);
                if (rb->have_ioref)
                        percpu_ref_put(&ca->io_ref);
@@ -1247,19 +1276,17 @@ start:
        bch2_time_stats_update(&c->times[BCH_TIME_btree_node_read],
                               rb->start_time);
        bio_put(&rb->bio);
-       printbuf_exit(&buf);
 
        if (saw_error && !btree_node_read_error(b)) {
-               struct printbuf buf = PRINTBUF;
-
+               printbuf_reset(&buf);
                bch2_bpos_to_text(&buf, b->key.k.p);
                bch_info(c, "%s: rewriting btree node at btree=%s level=%u %s due to error",
-                        __func__, bch2_btree_ids[b->c.btree_id], b->c.level, buf.buf);
-               printbuf_exit(&buf);
+                        __func__, bch2_btree_id_str(b->c.btree_id), b->c.level, buf.buf);
 
                bch2_btree_node_rewrite_async(c, b);
        }
 
+       printbuf_exit(&buf);
        clear_btree_node_read_in_flight(b);
        wake_up_bit(&b->flags, BTREE_NODE_read_in_flight);
 }
@@ -1363,14 +1390,20 @@ static void btree_node_read_all_replicas_done(struct closure *cl)
                }
 
                written2 = btree_node_sectors_written(c, ra->buf[i]);
-               if (btree_err_on(written2 != written, BTREE_ERR_FIXABLE, c, NULL, b, NULL,
+               if (btree_err_on(written2 != written, -BCH_ERR_btree_node_read_err_fixable,
+                                c, NULL, b, NULL,
+                                btree_node_replicas_sectors_written_mismatch,
                                 "btree node sectors written mismatch: %u != %u",
                                 written, written2) ||
                    btree_err_on(btree_node_has_extra_bsets(c, written2, ra->buf[i]),
-                                BTREE_ERR_FIXABLE, c, NULL, b, NULL,
+                                -BCH_ERR_btree_node_read_err_fixable,
+                                c, NULL, b, NULL,
+                                btree_node_bset_after_end,
                                 "found bset signature after last bset") ||
                    btree_err_on(memcmp(ra->buf[best], ra->buf[i], written << 9),
-                                BTREE_ERR_FIXABLE, c, NULL, b, NULL,
+                                -BCH_ERR_btree_node_read_err_fixable,
+                                c, NULL, b, NULL,
+                                btree_node_replicas_data_mismatch,
                                 "btree node replicas content mismatch"))
                        dump_bset_maps = true;
 
@@ -1565,7 +1598,7 @@ void bch2_btree_node_read(struct bch_fs *c, struct btree *b,
                struct printbuf buf = PRINTBUF;
 
                prt_str(&buf, "btree node read error: no device to read from\n at ");
-               btree_pos_to_text(&buf, c, b);
+               bch2_btree_pos_to_text(&buf, c, b);
                bch_err(c, "%s", buf.buf);
 
                if (c->recovery_passes_explicit & BIT_ULL(BCH_RECOVERY_PASS_check_topology) &&
@@ -1669,8 +1702,7 @@ err:
 int bch2_btree_root_read(struct bch_fs *c, enum btree_id id,
                        const struct bkey_i *k, unsigned level)
 {
-       return bch2_trans_run(c, __bch2_btree_root_read(&trans, id, k, level));
-
+       return bch2_trans_run(c, __bch2_btree_root_read(trans, id, k, level));
 }
 
 void bch2_btree_complete_write(struct bch_fs *c, struct btree *b,
@@ -1732,15 +1764,13 @@ static void __btree_node_write_done(struct bch_fs *c, struct btree *b)
 
 static void btree_node_write_done(struct bch_fs *c, struct btree *b)
 {
-       struct btree_trans trans;
-
-       bch2_trans_init(&trans, c, 0, 0);
+       struct btree_trans *trans = bch2_trans_get(c);
 
-       btree_node_lock_nopath_nofail(&trans, &b->c, SIX_LOCK_read);
+       btree_node_lock_nopath_nofail(trans, &b->c, SIX_LOCK_read);
        __btree_node_write_done(c, b);
        six_unlock_read(&b->c.lock);
 
-       bch2_trans_exit(&trans);
+       bch2_trans_put(trans);
 }
 
 static void btree_node_write_work(struct work_struct *work)
@@ -1769,7 +1799,7 @@ static void btree_node_write_work(struct work_struct *work)
                }
        } else {
                ret = bch2_trans_do(c, NULL, NULL, 0,
-                       bch2_btree_node_update_key_get_iter(&trans, b, &wbio->key,
+                       bch2_btree_node_update_key_get_iter(trans, b, &wbio->key,
                                        BCH_WATERMARK_reclaim|
                                        BTREE_INSERT_JOURNAL_RECLAIM|
                                        BTREE_INSERT_NOFAIL|
@@ -1803,7 +1833,8 @@ static void btree_node_write_endio(struct bio *bio)
        if (wbio->have_ioref)
                bch2_latency_acct(ca, wbio->submit_time, WRITE);
 
-       if (bch2_dev_io_err_on(bio->bi_status, ca, "btree write error: %s",
+       if (bch2_dev_io_err_on(bio->bi_status, ca, BCH_MEMBER_ERROR_write,
+                              "btree write error: %s",
                               bch2_blk_status_to_str(bio->bi_status)) ||
            bch2_meta_write_fault("btree")) {
                spin_lock_irqsave(&c->btree_write_error_lock, flags);
@@ -1874,7 +1905,7 @@ void __bch2_btree_node_write(struct bch_fs *c, struct btree *b, unsigned flags)
        struct bset *i;
        struct btree_node *bn = NULL;
        struct btree_node_entry *bne = NULL;
-       struct sort_iter sort_iter;
+       struct sort_iter_stack sort_iter;
        struct nonce nonce;
        unsigned bytes_to_write, sectors_to_write, bytes, u64s;
        u64 seq = 0;
@@ -1947,7 +1978,7 @@ do_write:
 
        bch2_sort_whiteouts(c, b);
 
-       sort_iter_init(&sort_iter, b);
+       sort_iter_stack_init(&sort_iter, b);
 
        bytes = !b->written
                ? sizeof(struct btree_node)
@@ -1962,7 +1993,7 @@ do_write:
                        continue;
 
                bytes += le16_to_cpu(i->u64s) * sizeof(u64);
-               sort_iter_add(&sort_iter,
+               sort_iter_add(&sort_iter.iter,
                              btree_bkey_first(b, t),
                              btree_bkey_last(b, t));
                seq = max(seq, le64_to_cpu(i->journal_seq));
@@ -1991,14 +2022,14 @@ do_write:
        i->journal_seq  = cpu_to_le64(seq);
        i->u64s         = 0;
 
-       sort_iter_add(&sort_iter,
+       sort_iter_add(&sort_iter.iter,
                      unwritten_whiteouts_start(c, b),
                      unwritten_whiteouts_end(c, b));
        SET_BSET_SEPARATE_WHITEOUTS(i, false);
 
        b->whiteout_u64s = 0;
 
-       u64s = bch2_sort_keys(i->start, &sort_iter, false);
+       u64s = bch2_sort_keys(i->start, &sort_iter.iter, false);
        le16_add_cpu(&i->u64s, u64s);
 
        BUG_ON(!b->written && i->u64s != b->data->keys.u64s);